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136 lines
5.4 KiB
Plaintext
136 lines
5.4 KiB
Plaintext
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications.
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* Portions created by the Initial Developer are Copyright (C) 2002
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Mike Pinkerton <pinkerton@netscape.com>
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* Kathleen Brade <brade@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsISupports.idl"
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interface nsITransferable;
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interface nsIDragSession;
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interface nsIDOMEvent;
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/**
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* Interfaces for overriding the built-in drag, drop, copy, and paste
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* implementations in the content area and editors. Use this to do things
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* such as prevent a drag from starting, adding or removing
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* data and flavors, or preventing the drop.
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*
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* Embedders who want to have these hooks made available should implement
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* nsIClipboardDragDropHooks and use the command manager to send the
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* appropriate commands with these parameters/settings:
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* command: cmd_clipboardDragDropHook
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*
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* params value type possible values
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* "addhook" isupports nsIClipboardDragDropHooks as nsISupports
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* "removehook" isupports nsIClipboardDragDropHooks as nsISupports
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*
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* Notes:
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* * Overrides/hooks need to be added to each window (as appropriate).
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* Adding them to the first window does not enable them for every window.
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* * If more than one implementation is set for a window, the hooks will be
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* called in the order they are added.
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* * Adding the same hook to the same window will not add a second call.
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* Each hook can only be called once per user action/api.
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* * Not all hooks are guaranteed to be called. If there are multiple hooks
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* set for a window, any of them has an opportunity to cancel the action
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* so no further processing will occur.
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* * If any errors occur (without setting the boolean result) the default
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* action will occur.
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* * AllowDrop will be called MANY times during drag so ensure that it is
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* efficient.
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*/
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[scriptable,uuid(e03e6c5e-0d84-4c0b-8739-e6b8d51922de)]
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interface nsIClipboardDragDropHooks : nsISupports
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{
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/**
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* Prevents the drag from starting
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*
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* @param event DOM event (drag gesture)
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*
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* @return TRUE drag can proceed
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* @return FALSE drag is cancelled, does not go to OS
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*/
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boolean allowStartDrag(in nsIDOMEvent event);
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/**
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* Tells gecko whether a drop is allowed on this content area
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*
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* @param event DOM event (drag over)
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* @param session the drag session from which client can get
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* the flavors present or the actual data
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*
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* @return TRUE indicates to OS that if a drop does happen on this
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* browser, it will be accepted.
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* @return FALSE indicates to OS drop is not allowed. On win32, this
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* will change the cursor to "reject".
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*/
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boolean allowDrop(in nsIDOMEvent event, in nsIDragSession session);
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/**
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* Alter the flavors or data presented to the OS
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* Used for drag and copy actions
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* Because this can be called many times, it is highly recommended
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* that the implementation be very efficient so user feedback is
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* not negatively impacted.
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*
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* @param event DOM event (drag drop); null if triggered by copy.
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* @param trans the transferable holding the list of flavors
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* and the data for each flavor
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*
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* @return TRUE copy/drag can proceed
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* @return FALSE copy/drag is cancelled, does not go to OS
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*/
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boolean onCopyOrDrag(in nsIDOMEvent aEvent, in nsITransferable trans);
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/**
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* Provide an alternative action to the built-in behavior when
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* something is dropped on the browser or in an editor
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*
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* @param event DOM event (drag drop); null if triggered by paste.
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* @param trans the transferable holding the list of flavors
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* and the data for each flavor
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*
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* @return TRUE action was handled, do not perform built-in
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* behavior
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* @return FALSE action was not overridden, do built-in behavior
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*/
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boolean onPasteOrDrop(in nsIDOMEvent event, in nsITransferable trans);
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};
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